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* Try attaching a pulp or pull-down resistor where you see noise at a terminal. 1 Mohm is a reasonable value to start. Don't make it low enough to affect operation. * Check where sensor wires are high impedance. Ambient mains hum may be present in the troublesome house. If mains hum reaches high impedance wiring, the wiring picks it up like an a
Open source tools required for mechanical & thermal designers. Any open source tools required for Mechanical engineers like opening common files 3d files like .step etc create simple structures for representation. Any open source tools required for Thermal engineers Via /PCB trace temperature rise airflow, heat sink simulations simple t
Hello experts! I am trying to build a simple rectenna system on a flexible board to turn on an LED. I started off with ADS simulation, followed by PCB fabrication on conventional FR4 board. Till here, everything worked fine and the LED turned on at 2~3 meters away from the transmitting antenna. However, if I move the circuit to a flexible b
Hه is it better build a direction finder in a tower all part together that means antenna and digital and ... in the end only with a Lan cable from tower connect to your pc. OR like R&S build antenna separated from your RACK( Receiver and DSP) i think first one has a lot pros (you dont need alot of RF cable from tower to RACK or you do
I have a prototype board which has two RF modules on it, a 2.4GHz Wifi module (ESP-01) and a low cost 433.92MHz RF receiver module (Wenshing RWS-371F-6). My 433MHz transmitter (a remote control) sends data encoded in manchester to be decoded by the receiver, this part is working well. The data rate is 2000 bits per second and I am using 433.92MHz S
No you are firstly asking about relation between transmitted power and EIRP, a matter of antenna gain. Secondly between EIRP and field strength. Power density at a specific distance is EIRP/sphere surface area. Convert to field strength by applying field impedance of 377 ohms. - - - Updated - - - You can use
As a way to learn more about RF design, I am considering to build an FM Band receiver. I am not looking for a professional level outcome but rather to learn. I have an oscilloscope with 200MHz bandwidth, as well as a low cost VNA. I built the attached block diagram for how the receiver would look like. Cost is not a concern as I am not looking for
Hello there, I'm curious why the PN junction of a BJT transistor is still used as the CTAT voltage in a reference circuit (bandgap), while a MOSFET threshold voltage also has CTAT behavior? Is it because the BJT has exponential behavior while the MOSFET is just the square of the voltage? Why is the BJT better? Thanks
Hello, if we measure antennas in the antenna chamber with vector-network-analyzer (VNA). Let's say two identical antennas: The measured S21 transmission parameter (divided by 2 and corrected for freespace loss) is available for each angle (azimuth, elevation). How do I reproduce those results with HFSS. Farfield result: (...)
Hello guys, i am currently working on my final project, and its about eddy current brake. But when i want to simulate the design, and of course i use set eddy effect, on the excitations, but when i use that message error appear, can someone help me with this? Thank you. 156637
The field strength of a circular coil can be easily calculated using Biot-Savart's law. See . The axial field strength calculates as follows H = 1/2 * (I*a?)/((r? + a?)^1.5), a coil radius, r axial distance For spiral antennas, add field of individual circul
Hi, I am designing toothed log periodic that covers 900MHz, 1800MHz, 2100MHz, 2600MHz, 2450MHz. I will be designing on 160cmx160cm board. What is typically the first step to design such antenna. Also, how can i determine the number of tooths/radiators require? Thanks.
i designed an array of patch antenna with coaxial fed, and defined it as wave port, but i need put it in a radiation box so i need defined is as lumped port , how i can do that ? i'm not perfect in hfss program can any body help me please ?
<50W if the Radar receiver do not use continually rotating antenna (mechanical).
While combining some fabricated blocks I observed following behavior: antenna module: Wideband antenna with 3GHz bandwidth, input impedance is 100 Ohm. Receiver module 1: FET based mixer receiver with some complex impedance. Receiver module 2: FET based mixer receiver with some complex impedance + matching structure to 100 Ohm. All componen
I note that the simulation is a "mathematical solution" and that the mathematics is quite detailed and useful. HFSS was finite element based but now one can invoke additional solvers. Array factor is a function of both number of elements and spacing. If your elements do not have identical power patterns and other than zero phase offset the res
Yes, you can connect HDMI PC Output to CVBS Input of the TV by using MINI HDMI 2AV adapter. If the TV set hasn't got CVBS Input, you will have to buy RF Modulator to connect thru aerial antenna..
Hi All, I need to develop an circuit and antenna that will be placed on a person's body, and generate a constant electromagnetic field (for medical purposes). The definitions I received for this project is to generate a field from 10Hz to 700Hz, with field strength of 0.2 mTesla (that is 2 Gauss). I'm not an RF engineer and have very limit
Hi All, I need to develop an circuit and antenna that will be placed on a person's body, and generate a constant electromagnetic field (for medical purposes). The definitions I received for this project is to generate a field from 10Hz to 700Hz, with field strength of 0.2 mTesla (that is 2 Gauss). I'm not an RF engineer and have very limit
Hi guys, I'm modeling a grounded co planar microstrip antenna in HFSS and having some problems with the excitation. The excitation dimensions are below. The antenna should oscillate at three frequencies. Its been almost 2 weeks since i started this work and still nothing works. someone plz help with this.156324[ATTACH=CONF